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---*/

/**
 * @file
 *
 * New version of logger.  Based on logger.h
 * 
 * $Id: logger2.h 2 2004-06-24 21:10:31Z sears $
 * 
 */


#ifndef __LOGGER2_H__
#define __LOGGER2_H__

#include "logEntry.h"
#include "logHandle.h"
#include <lladd/operations.h>
/**
   Contains the state needed by the logging layer to perform
   operations on a transaction.
 */
typedef struct {
  int xid; 
  lsn_t prevLSN;
  LogHandle lh;
} TransactionLog;

/**
   Inform the logging layer that a new transaction has begun.
   Currently a no-op.
*/
TransactionLog LogTransBegin(int xid);

/**
  Write a transaction COMMIT to the log tail, then flush the log tail immediately to disk

  @return 0 if the transaction succeeds, an error code otherwise.
*/
void LogTransCommit(TransactionLog * l);

/**
  Write a transaction ABORT to the log tail

  @return 0 if the transaction was successfully aborted.
*/
void LogTransAbort(TransactionLog * l);

/**
  LogUpdate writes an UPDATE log record to the log tail
*/
LogEntry * LogUpdate(TransactionLog * l, recordid rid, int operation, const byte * args);
/* *
   (Was folded into LogUpdate.)

   Logs the fact that a rid has been allocated for a transaction.
   @ todo Should this be folded into LogUpdate?  (Make "alloc" an operation...)
   @ todo Surely, we need a dealloc!
 */
/*lsn_t LogTransAlloc(TransactionLog * l, recordid rid);*/


/**
   Write a compensation log record.  These records are used to allow
   for efficient recovery, and possibly for log truncation.  They
   record the completion of undo operations.

   @return the lsn of the CLR entry that was written to the log.
   (Needed so that the lsn slot of the page in question can be
   updated.)  

   @todo Remove this from this interface?  Should it be internal to
   the recovery routines?
*/
lsn_t LogCLR (LogEntry * undone); /*TransactionLog * l, long ulLSN, recordid ulRID, long ulPrevLSN); */

/**
   Write a end transaction record @todo What does this do exactly?  Indicate completion of aborts?
   @todo Move into recovery-only code?
*/
void LogEnd (TransactionLog * l);

#endif
